CSP
−
900RMM
−
2
MD Helicopters, Inc.
Rotorcraft Maintenance Manual
Page 1
Revision 25
29-00-00
HYDRAULIC SYSTEM
DESCRIPTION AND OPERATION
1. Hydraulic System
The hydraulic control system is a dual circuit
system. The system supplies pressure to three
dual circuit servoactuators to assist main rotor
flight controls operation. System 2 also
supplies pressure to a single circuit servoac
tuator to assist anti-torque/directional flight
controls operation. The hydraulic system uses
hydraulic fluid (C112) that is approved for
operations in temperatures between -40
°
F to
+275
°
F. Servicing is accomplished by using
ground support equipment, or the optional
hand pump.
Systems 1 and 2 operate nominally at 500
psig. If pressure is lost in one of the hydraulic
systems, the remaining system pump output
pressure increases to 1000 psig. Each circuit
consists of the following components:
2. Hydraulic Components
A. Variable Delivery Pumps
The two hydraulic pumps are piston type
variable displacement pumps capable of
providing flow rates up to 2.2 gpm. Each pump
is driven by an accessory drive on the main
transmission. The pump drive shaft is coupled
to the transmission accessory drive by a spline
which will shear in the event of a physical
overload.
Each pump contains nine pistons arranged
axially in a floating cylinder block. A compen
sator circuit varies pump displacement to
maintain a constant 500 psig during varying
system flow requirements, providing rapid
pump response. Mechanical stops at full flow
and full cut off positions prevent system
damage.
If pressure is lost in one of the hydraulic
systems, the functioning system's pump
compensator circuit is reset to 1000 psig. The
compensator is reset when the mis-function
ing system's pressure decreases to between
200 psig and 400 psig.
Fluid is carried through drilled passages to the
contact face of each piston shoe for lubrication,
cooling, and hydrostatic balance. This hydro
static balance reduces bearing contact
pressures, minimizing friction and wear. Other
parts are lubricated and cooled with this fluid
as it circulates at 0.02 to 0.08 gpm through the
pump and returns to the manifold/reservoir.
B. Manifold/Reservoir Assemblies
The manifold/reservoir assembly distributes
the pressurized hydraulic fluid to the servoac
tuators. The manifold/reservoir assembly is
the collection point for the fluid returns, and
contains the system operating fluid. The
manifold/reservoir assembly components are
mounted in an aluminum alloy housing. All
fluid connection fittings on the manifold/reser
voir are of the ring-lock type.
The bootstrap reservoir prevents cavitation
during high system flow demands. It main
tains a 2.4 psig minimum static pressure to
the pump when the system is shut down and
27 psig during normal system operation.
The reservoir bleed valve provides for removal
of entrapped air and prevents the reservoir
from being over pressurized above 150 psig.
The valve is a spring-loaded valve used to
bleed the system during servicing. The valve is
mounted in the housing assembly at the
highest point.
CURRENT CONFIG -
The
bleed valve is also used for obtaining fluid
samples.
A system relief valve prevents damage to the
hydraulic system in the event the pressure
compensator in the pump malfunctions. The
valve actuates at 1350 psig and resets at a
minimum pressure of 1150 psig.
The pressure and return filters are standard
five micron filter elements contained in
threaded filter bowls. When the filter bowl
assembly is removed a shutoff valve closes,
isolating the system fluid to prevent leakage.
A set of spring-loaded levers prevent the filter
bowl from being installed without the filter
element.
Summary of Contents for CSP-900RMM-2
Page 19: ...CSP 900RMM 2 MD Helicopters Inc Rotorcraft Maintenance Manual INTRODUCTION Chapter ...
Page 20: ......
Page 23: ...CSP 900RMM 2 MD Helicopters Inc Rotorcraft Maintenance Manual Section 01 00 00 Introduction ...
Page 24: ......
Page 44: ......
Page 48: ......
Page 62: ......
Page 68: ......
Page 74: ......
Page 78: ......
Page 84: ......
Page 100: ......
Page 122: ......
Page 154: ......
Page 223: ...CSP 900RMM 2 MD Helicopters Inc Rotorcraft Maintenance Manual DIMENSIONS AND AREAS Chapter ...
Page 224: ......
Page 228: ......
Page 249: ...CSP 900RMM 2 MD Helicopters Inc Rotorcraft Maintenance Manual LIFTING AND JACKING Chapter ...
Page 250: ......
Page 254: ......
Page 260: ......
Page 264: ......
Page 273: ...CSP 900RMM 2 MD Helicopters Inc Rotorcraft Maintenance Manual Section 08 20 00 Leveling ...
Page 274: ......
Page 277: ...CSP 900RMM 2 MD Helicopters Inc Rotorcraft Maintenance Manual TOWING Chapter ...
Page 278: ......
Page 281: ...CSP 900RMM 2 MD Helicopters Inc Rotorcraft Maintenance Manual Section 09 00 00 Towing ...
Page 282: ......
Page 286: ......
Page 287: ...CSP 900RMM 2 MD Helicopters Inc Rotorcraft Maintenance Manual PARKING AND MOORING Chapter ...
Page 288: ......
Page 292: ......
Page 299: ...CSP 900RMM 2 MD Helicopters Inc Rotorcraft Maintenance Manual Section 10 20 00 Mooring ...
Page 300: ......
Page 306: ......
Page 308: ......
Page 311: ...CSP 900RMM 2 MD Helicopters Inc Rotorcraft Maintenance Manual PLACARDS AND MARKINGS Chapter ...
Page 312: ......
Page 316: ......
Page 333: ...CSP 900RMM 2 MD Helicopters Inc Rotorcraft Maintenance Manual SERVICING Chapter ...
Page 334: ......
Page 337: ...CSP 900RMM 2 MD Helicopters Inc Rotorcraft Maintenance Manual Section 12 00 00 Servicing ...
Page 338: ......
Page 368: ......
Page 372: ......
Page 390: ......
Page 401: ...CSP 900RMM 2 MD Helicopters Inc Rotorcraft Maintenance Manual Section 21 20 00 Vent System ...
Page 402: ......
Page 416: ......
Page 458: ......
Page 466: ......
Page 525: ...CSP 900RMM 2 MD Helicopters Inc Rotorcraft Maintenance Manual EQUIPMENT FURNISHINGS Chapter ...
Page 526: ......
Page 542: ......
Page 544: ......
Page 570: ......
Page 572: ......
Page 584: ......
Page 590: ......
Page 594: ......
Page 596: ......
Page 602: ......
Page 604: ......
Page 622: ......
Page 624: ......
Page 626: ......
Page 627: ...CSP 900RMM 2 MD Helicopters Inc Rotorcraft Maintenance Manual Section 25 60 10 Rescue Hoist ...
Page 628: ......
Page 632: ......
Page 644: ......
Page 646: ......
Page 648: ......
Page 654: ......
Page 655: ...CSP 900RMM 2 MD Helicopters Inc Rotorcraft Maintenance Manual FIRE PROTECTION Chapter ...
Page 656: ......
Page 662: ......
Page 672: ......
Page 678: ......
Page 686: ......
Page 692: ......
Page 698: ......
Page 711: ...CSP 900RMM 2 MD Helicopters Inc Rotorcraft Maintenance Manual FUEL SYSTEM Chapter ...
Page 712: ......
Page 721: ...CSP 900RMM 2 MD Helicopters Inc Rotorcraft Maintenance Manual Section 28 00 00 Fuel System ...
Page 722: ......
Page 846: ......
Page 878: ......
Page 887: ...CSP 900RMM 2 MD Helicopters Inc Rotorcraft Maintenance Manual HYDRAULIC SYSTEM Chapter ...
Page 888: ......
Page 892: ......
Page 925: ...CSP 900RMM 2 MD Helicopters Inc Rotorcraft Maintenance Manual LANDING GEAR Chapter ...
Page 926: ......
Page 932: ......
Page 980: ......
Page 983: ...CSP 900RMM 2 MD Helicopters Inc Rotorcraft Maintenance Manual DOORS AND WINDOWS Chapter ...
Page 984: ......
Page 992: ......
Page 1048: ......
Page 1049: ...CSP 900RMM 2 MD Helicopters Inc Rotorcraft Maintenance Manual FUSELAGE Chapter ...
Page 1050: ......
Page 1063: ...CSP 900RMM 2 MD Helicopters Inc Rotorcraft Maintenance Manual Section 53 00 00 Fuselage ...
Page 1064: ......
Page 1072: ......
Page 1078: ......
Page 1096: ......
Page 1134: ......
Page 1204: ......
Page 1205: ...CSP 900RMM 2 MD Helicopters Inc Rotorcraft Maintenance Manual Section 53 40 00 Tailboom ...
Page 1206: ......
Page 1235: ...CSP 900RMM 2 MD Helicopters Inc Rotorcraft Maintenance Manual Section 53 55 00 Empennage ...
Page 1236: ......
Page 1259: ...CSP 900RMM 2 MD Helicopters Inc Rotorcraft Maintenance Manual Chapter MAIN ROTOR ...
Page 1260: ......
Page 1272: ......
Page 1282: ......
Page 1330: ......
Page 1390: ......
Page 1440: ......
Page 1452: ......
Page 1462: ......
Page 1474: ......
Page 1503: ...CSP 900RMM 2 MD Helicopters Inc Rotorcraft Maintenance Manual Section 63 20 00 Gearboxes ...
Page 1504: ......
Page 1558: ......
Page 1579: ...CSP 900RMM 2 MD Helicopters Inc Rotorcraft Maintenance Manual Section 63 22 00 Rotor Brake ...
Page 1580: ......
Page 1598: ......
Page 1600: ......
Page 1612: ......
Page 1619: ...CSP 900RMM 2 MD Helicopters Inc Rotorcraft Maintenance Manual ANTI TORQUE ASSEMBLY Chapter ...
Page 1620: ......
Page 1626: ......
Page 1648: ......
Page 1672: ......
Page 1678: ......
Page 1685: ...CSP 900RMM 2 MD Helicopters Inc Rotorcraft Maintenance Manual FLIGHT CONTROLS Chapter ...
Page 1686: ......
Page 1706: ......
Page 1732: ......
Page 1828: ......
Page 1834: ......
Page 1842: ......
Page 1927: ...CSP 900RMM 2 MD Helicopters Inc Rotorcraft Maintenance Manual POWERPLANT Chapter ...
Page 1928: ......
Page 1935: ...CSP 900RMM 2 MD Helicopters Inc Rotorcraft Maintenance Manual Section 71 00 00 Powerplant ...
Page 1936: ......
Page 1958: ......
Page 1985: ...CSP 900RMM 2 MD Helicopters Inc Rotorcraft Maintenance Manual Section 71 20 00 Engine Mounts ...
Page 1986: ......
Page 1988: ......
Page 1994: ......
Page 2001: ...CSP 900RMM 2 MD Helicopters Inc Rotorcraft Maintenance Manual Section 71 60 00 Air Intake ...
Page 2002: ......
Page 2012: ......
Page 2033: ...CSP 900RMM 2 MD Helicopters Inc Rotorcraft Maintenance Manual Section 71 70 00 Engine Drains ...
Page 2034: ......
Page 2042: ......
Page 2043: ...CSP 900RMM 2 MD Helicopters Inc Rotorcraft Maintenance Manual ENGINE BLEED AIR Chapter ...
Page 2044: ......
Page 2048: ......
Page 2053: ...CSP 900RMM 2 MD Helicopters Inc Rotorcraft Maintenance Manual ENGINE CONTROLS Chapter ...
Page 2054: ......
Page 2058: ......
Page 2105: ...CSP 900RMM 2 MD Helicopters Inc Rotorcraft Maintenance Manual ENGINE EXHAUST Chapter ...
Page 2106: ......
Page 2109: ...CSP 900RMM 2 MD Helicopters Inc Rotorcraft Maintenance Manual Section 78 00 00 Engine Exhaust ...
Page 2110: ......
Page 2116: ......
Page 2120: ......
Page 2121: ...CSP 900RMM 2 MD Helicopters Inc Rotorcraft Maintenance Manual ENGINE OIL Chapter ...
Page 2122: ......
Page 2125: ...CSP 900RMM 2 MD Helicopters Inc Rotorcraft Maintenance Manual Section 79 00 00 Engine Oil ...
Page 2126: ......